Chen Zhimin, Maus Gerrit W, Whitney David, Denison Rachel N
Department of Psychology, University of California Berkeley, Berkeley, CA, USADepartment of Psychology, Peking University, Beijing, P. R. China.
Department of Psychology, University of California Berkeley, Berkeley, CA, USADivision of Psychology, School of Humanities and Social Sciences, Nanyang Technological University, Singapore.
J Vis. 2017 Jan 1;17(1):8. doi: 10.1167/17.1.8.
During perceptual rivalry, an observer's perceptual experience alternates over time despite constant sensory stimulation. Perceptual alternations are thought to be driven by conflicting or ambiguous retinal image features at a particular spatial location and modulated by global context from surrounding locations. However, rivalry can also occur between two illusory stimuli-such as two filled-in stimuli within the retinal blind spot. In this "filling-in rivalry," what observers perceive in the blind spot changes in the absence of local stimulation. It remains unclear if filling-in rivalry shares common mechanisms with other types of rivalry. We measured the dynamics of rivalry between filled-in percepts in the blind spot, finding a high degree of exclusivity (perceptual dominance of one filled-in percept, rather than a perception of transparency), alternation rates that were highly consistent for individual observers, and dynamics that closely resembled other forms of perceptual rivalry. The results suggest that mechanisms common to a wide range of rivalry situations need not rely on conflicting retinal image signals.
在知觉竞争过程中，尽管感觉刺激持续存在，但观察者的知觉体验会随时间交替变化。知觉交替被认为是由特定空间位置上相互冲突或模糊的视网膜图像特征驱动的，并受到周围位置的全局背景调节。然而，竞争也可能发生在两个虚幻刺激之间，比如视网膜盲点内的两个填充刺激。在这种“填充竞争”中，观察者在盲点处感知到的内容在没有局部刺激的情况下发生变化。目前尚不清楚填充竞争是否与其他类型的竞争具有共同机制。我们测量了盲点处填充知觉之间的竞争动态，发现具有高度排他性（一个填充知觉的知觉优势，而非透明感）、个体观察者的交替率高度一致，且动态过程与其他形式的知觉竞争极为相似。结果表明，广泛的竞争情况所共有的机制不一定依赖于相互冲突的视网膜图像信号。
